摘要:
The present invention provides a lubricating composition comprising: (i) a base oil; (ii) a non-silicone anti-foam agent; and (iii) one or more performance additives; wherein the composition has a kinematic viscosity at 100° C. (according to ASTM D445) of 16.3 mm2/s or less, a low temperature cranking viscosity of at most 6600 cP at −30° C. (ASTM D5293) and a NOACK volatility of at most 11% according to CEC-L-40-93.
摘要:
A staged method of forming vinyl (e.g. acrylate) copolymer by solution polymerization which involves a) charging up to 90% of at least two vinyl monomers of the vinyl copolymer to a first stage reaction zone, b) polymerizing the at least two vinyl monomers to about 10 to 90% conversion in the presence of an initiator at an initiator to monomers mole ratio within a specified range, the monomer content of one of the at least two vinyl monomers of the copolymer formed in the first stage being higher than the content of another of the at least two vinyl monomers in the first stage polymer, the weight average molecular weight of the first stage copolymer being about 2000 to 500,000 Daltons; and c) continuing polymerization in the presence of an initiator in a second stage while continuously adding the balance of the monomers of said vinyl copolymer to the polymerization reaction mixture of the first stage at a monomers ratio lower in the one monomer than in the first stage monomers ratio, the initiator to monomers mole ratio in the second stage being different than in the first stage; the vinyl copolymer formed gradually continuously changing in molecular weight from the first stage and increasing in concentration of the one monomer during the second stage, the weight average molecular weight of the total copolymer of both stages being about 2,000 to 250,000 Daltons.
摘要:
The present invention relates to diesel fuel and lubrication oil defoaming agents, and crude oil demulsifiers, as well as methods for using same. In particular, the defoaming agents and demulsifiers are comprised of copolymers which have structures constituting a backbone of polysiloxane onto which is grafted an organic group. These structures comprise a polymer of the formula MDxDnullyDnullzM, where M is O0.5Si(CH3)3, D is a OSi(CH3)2, Dnull is OSi(CH3)R, Dnull is OSi(CH3)Rnull, R is a polyhydric C6-C28 organic group, Rnull is a phenol derivative or a long chain aliphatic group or polyethers, z is between 0 and 80, xnullynullz is between 10-200, x/z is null1, and x/(ynullz) is between about 1 and about 5, or formula MnullDaMnull where Mnull is O0.5Si(CH3)2R, a is between 4-10, and R and D are the same as defined above.
摘要:
The invention relates to compositions for defoaming aqueous media, comprising as defoamers urea derivatives of the formula I where R1 is a hydrocarbon radical, preferably having 4 to 30 carbon atoms or a hydrocarbon radical, preferably having 4 to 24 carbon atoms and one nitrogen atom or a hydrocarbon radical, preferably having 4 to 30 carbon atoms and one carbonyl group, R2 is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms, R3 is a hydrogen atom or a hydrocarbon radical, preferably having 1 to 24 carbon atoms, R4 is an organic radical, preferably having 2 to 30 carbon atoms, and n is from 0 to 5; in the form of solid particles, which are obtained by crystallization from a clear homogeneous melt dispersed in a carrier medium, and a process of preparation thereof.
摘要:
A halocarbon oil composition suitable for use as a hydraulic fluid and lubricant in those applications in which hydrocarbon oils constitute a fire hazard or a contaminant because of their reactive properties. The composition is formed by a chemically-inert halocarbon oil having PTFE solid lubricant particles dispersed therein, the particles being in the micron range. Also included is a fluorochemical surfactant having foam-producing properties in an amount insufficient to generate foam in the context of the inherent non-foaming characteristics of the particles, the surfactant acting to enhance the lubricity of the oil and to stabilize the PTFE dispersion therein.
摘要:
Homogeneous and stable dispersions of organosiloxane polymers in mineral oils are provided by mixing at a temperature above 80.degree. C. organosiloxane polymer compositions and mineral oil compositions and solid ethylene/vinyl acetate copolymer. Such dispersions are excellent foam inhibitors for lubricating oil compositions.